Optimization of transition metal nanoparticle- phosphonium IL composite catalytic systems for deep hydrogenation and hydrodeoxygenation reactions

Banerjee, Abhinandan; Scott, Robert WJ

Optimization of transition metal nanoparticle- phosphonium IL composite catalytic systems for deep hydrogenation and hydrodeoxygenation reactions

dc.contributor.author	Banerjee, Abhinandan
dc.contributor.author	Scott, Robert WJ
dc.date.accessioned	2018-11-21T15:11:14Z
dc.date.available	2018-11-21T15:11:14Z
dc.date.issued	2015
dc.description.abstract	A variety of metal nanoparticle (NP)/tetraalkylphosphonium ionic liquid (IL) composite systems were evaluated as potential catalysts for the deep hydrogenation of aromatic molecules. Particles were synthesized by reducing appropriate metal salts by LiBH4 in a variety of ILs. Gold NPs were used as probes to investigate the effect of both chain lengths of the alkyl substituents on the phosphonium cation and the nature of anions, on the stability of NPs dispersed in the ILs. The presence of three medium-to-long alkyl chains (such as hexyl) along with one long alkyl chain (such as tetradecyl) in the IL, coupled with highly coordinating anions (such as halides, or to a smaller extent, bis-triflimides) produced the most stable dispersions. These ILs also showed maximum resistance to heat-induced sintering; for example, TEM studies of Pt NPs heated under hydrogen to 120 °C showed only moderate sintering in trihexyl(tetradecyl)phosphonium chloride and bis(triflimide) ILs. Finally, olefinic hydrogenations, aromatic hydrogenations, and hydrodeoxygenation of phenol were carried out with Ru, Pt, Rh and PtRh NPs using hydrogen at elevated pressures. From preliminary studies, Ru NPs dispersed in trihexyl(tetradecyl)phosphonium chloride emerged as the catalyst system of choice. The presence of borate Lewis-acid by-products in the reaction medium (from the borohydride reduction step) allowed for partial phenol hydrodeoxygenation.	en_US
dc.description.sponsorship	NSERC	en_US
dc.description.version	Peer Reviewed	en_US
dc.identifier.citation	A. Banerjee, R. W. J. Scott, Green Chem., 2015, 17, 1597-1604.	en_US
dc.identifier.doi	10.1039/C4GC01716A
dc.identifier.uri	http://hdl.handle.net/10388/11528
dc.publisher	Royal Society of Chemistry	en_US
dc.rights	Attribution-NonCommercial 2.5 Canada	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc/2.5/ca/	*
dc.subject	Ionic Liquid	en_US
dc.subject	Nanoparticles	en_US
dc.subject	Hydrogenation	en_US
dc.subject	Phenols	en_US
dc.title	Optimization of transition metal nanoparticle- phosphonium IL composite catalytic systems for deep hydrogenation and hydrodeoxygenation reactions	en_US
dc.type	Article	en_US